一种基于UDP的电力广域保护系统可靠通信方法

A Reliability Communication Approach for Power Wide Area Protection System Based on UDP

电力广域保护系统从点到点通信逐步走向网络化通信,如何在拥塞状态下保障业务的实时性和可靠性,成为亟待解决的问题.针对传输控制协议(Transmission control protocol,TCP)不能保障实时性以及用户数据报协议(User datagram protocol,UDP)不能保障可靠性的问题,本文提出一种联合应用层纠错、检错和重发机制的UDP传输方案,在提供低时延传输服务的同时也能保障报文的可靠性.考虑到算法的复杂性,选择本原BCH(Bose-Chaudhuri-Hocquenghem)码作为纠错编码算法,设计了编码分组方法,并通过实验验证了分组方法的正确性;对增加纠错机制后的报文实时性进行了理论分析和仿真验证;为了解决突发误码和丢包情况下的可靠性问题,进一步设计了应用层检错和重发机制,并分析了时延.分析表明,在应用层增加本文所设计的纠错、检错和重发机制后增加的时延几乎可以忽略不计.最后给出了所提方法的联合应用算法,并进行了可靠性分析,结果表明本文方案的可靠性高于其他UDP传输方案.

The communications of a wide area protection system are transforming from point-to-point to networked connections.Guaranteeing the real-time and reliability of communication services under a congestion state has become an urgent issue.Aiming at the problem of transmission control protocol(TCP)cannot guarantee realtime and user datagram protocol(UDP)cannot guarantee reliability,a UDP transmission scheme based on the mechanism of combining error correction,error detection,and retransmission for application messages is proposed.This scheme can provide low delay and reliable transmission service for applications.An original BCH(Bose-Chaudhuri-Hocquenghem)code is selected as the error correction coding algorithm considering the complexity of the algorithms,and a coding grouping method is designed.An experiment to verify the grouping method is also presented.We conduct theoretical analysis and simulations to verify the real-time of a message after employing the error correction mechanism.To provide reliability under the condition of having burst errors and packet loss,the mechanisms of error detection in the application layer and datagram retransmission are further designed,and their realtime performance is analyzed.The analysis reveals that the increased delays are nearly negligible when exploring the mechanisms designed in this study of error correction,error detection,and retransmission.Moreover,this paper presents a comprehensive application algorithm of the scheme and analyzes its reliability.The result shows that the reliability provided by the proposed scheme is higher than the other UDP transmission scheme.